In this third chapter of the Unreal Materials Masterclass series, we’ll learn what are UV coordinates, how are they used when we sample textures, and how to manipulate them to achieve a variety of useful effects.
Enjoy!
https://dev.epicgames.com/community/learning/tutorials/178j/unreal-engine-fortnite-unreal-5-8-materials-masterclass-chapter-3-the-magic-of-uvs